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8
Step 3 — Install Evaporator (Supply)
Ductwork —
Connect ducts to evaporator section with
flexible connections. Attach ducts to building structure and in-
sulate with fiberglass and vapor barrier to prevent sound trans-
mission and condensation.
Step 4 — Install Return-Air Ductwork —
Unit is
designed for free return through the unit-mounted grille and fil-
ters. When installing ductwork and filter rack, use accepted
ductwork installation procedures and do not hang the ductwork
from the unit. Follow all applicable codes.
Step 5 — Check Return-Air Filters —
Be sure fil-
ters shipped with unit are the correct size (see Table 2). Never
operate unit without return-air filters in place.
Step 6 — Make Condenser Connections —
In-
stall air-cooled condenser in accordance with the installation
instructions provided with condenser. Connection locations for
liquid and refrigerant discharge service lines are shown in
Fig. 1-5. Recommended line sizes are given in Table 3. Refer
to Carrier System Design Manual, Part 3, for standard refriger-
ant piping techniques.
Remote condenser units are shipped with a holding charge
of nitrogen. After refrigerant connections are made, release ni-
trogen, evacuate, leak test, and charge system as described in
the Checking System Charge section on page 20.
Step 7 — Install Condensate Drain Line —
The
50XCR unit has a drain connection for evaporator condensate.
When connecting condensate drains from the unit to floor
drains, sinks, or hoppers, connect drains downstream of trap to
ensure that condensate does not drain back into the unit.
Make connections through the unit side panel. Some appli-
cations may require connection to either galvanized steel or
copper drain pipe; consult local code requirements for details.
See Fig. 8.
Pitch drain pipe downward at a slope of at least
1
/
4
-in. per ft
for proper drainage. Provide tees plugged on one side for clean
outs. Leave clearance for servicing, and observe all local sani-
tary codes.
The condensate trap should have a depth adequate to allow
3-in. of water in the trap (see Fig. 8) with the unit running.
Table 3 — Recommended Line Sizes (in.)
LEGEND
SPREADER BAR
SUPPORTS
UNDER SKID
Fig. 6 — 50XCR Unit Rigging
a50-6556ef
Fig. 7 — Unit Clearances
NOTE: Dimensions are in inches.
a50-8660
24 (TYP)
36
36
IMPORTANT: NEVER use pipe smaller than
3
/
4
inches
in the drain run.
50XC
UNIT SIZE
CIRCUIT
LENGTH OF RUN (ft)
0 to 15
16 to 25
26 to 50
51 to 75
76 to 100
DIS
LIQ
DIS
LIQ
DIS
LIQ
DIS
LIQ
DIS
LIQ
06
1
5
/
8
1
/
2
7
/
8
1
/
2
7
/
8
1
/
2
7
/
8
5
/
8
7
/
8
5
/
8
08
1
5
/
8
1
/
2
7
/
8
1
/
2
7
/
8
1
/
2
7
/
8
5
/
8
7
/
8
5
/
8
12
1
7
/
8
5
/
8
7
/
8
5
/
8
1
1
/
8
5
/
8
1
1
/
8
5
/
8
1
1
/
8
5
/
8
14
1
7
/
8
5
/
8
7
/
8
5
/
8
1
1
/
8
5
/
8
1
1
/
8
5
/
8
1
1
/
8
5
/
8
16
2
1
1
/
8
5
/
8
1
1
/
8
5
/
8
1
1
/
8
5
/
8
1
3
/
8
7
/
8
7
/
8
7
/
8
24
2
1
1
/
8
5
/
8
1
1
/
8
5
/
8
1
3
/
8
5
/
8
1
3
/
8
7
/
8
1
1
/
8
7
/
8
HG
—
Hot Gas (Refrigerant Discharge)
LIQ
—
Liquid